By Arvind Gupta

ISBN-10: 818717188X

ISBN-13: 9788187171881

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**Extra info for Aha! Activities**

**Example text**

6. Fold the top strip inwards towards the bottom. 7. Fold the right vertical strip to the left. 8. Finally fold the bottom strip to the top. The square has three 6’s but one odd number 4. 39 9. We want all the numbers to be the same - namely 6. For this lift the corner with number 4. 10. Bring the flap to the centre, locking the flexagon in the process. Now all the four small squares will have the number 6 on them. 11. This lock is very crucial so practice it a few times. 12. This flexagon can be endlessly rotated / flexed to get faces with 1, 2, 3, 4, 5 and 6 (not necessarily in the same order) written on them.

Suppose these six containers were set outside to measure rainfall. Which bottle would collect the smallest amount of rain? Which would fill up first? 15 36 +47 98 +2 100 8 54 9 1 7 6 3 2 0 What rule was followed when these numbers were arranged? Here are digits from 1 to 9 arranged so they equal 100. Can you find another way to do this? What number can be added to 7 or multiplied by 7 to give the same answer. 55 TWENTY TRIANGLES MAKE A PERFECT SQUARE Using a little logic and twenty identical triangular pieces you can arrange them in an orderly fashion to construct a perfect square.

Cut out a triangle from its final fold. On opening the cut-out would you see pattern A or B? A B WHICH HOLDS MORE? Suppose these six containers were set outside to measure rainfall. Which bottle would collect the smallest amount of rain? Which would fill up first? 15 36 +47 98 +2 100 8 54 9 1 7 6 3 2 0 What rule was followed when these numbers were arranged? Here are digits from 1 to 9 arranged so they equal 100. Can you find another way to do this? What number can be added to 7 or multiplied by 7 to give the same answer.

### Aha! Activities by Arvind Gupta

by Daniel

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